ALLMERICA FINANCIAL CORP
SC 13G/A, 1999-02-12
FIRE, MARINE & CASUALTY INSURANCE
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<PAGE>   1
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (AMENDMENT NO. 1)*

                        Allmerica Financial Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   019754100
                               -----------------
                                 (CUSIP Number)

            December 31, 1998  - Amendment pursuant to Rule 13d-2(b)
- --------------------------------------------------------------------------------
           (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [X] Rule 13d-1(b)

         [ ] Rule 13d-1(c)

         [ ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

<PAGE>   2


- -------------------                               ------------------------------

CUSIP NO. 019754100             13G               Page    1     of    3    Pages
                                                       --------    -------
- -------------------                               ------------------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Boston Partners Asset Management, L.P.

- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ]
                                                                         (b) [ ]

          Not applicable

- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

        NUMBER OF                    -0- shares
          SHARES            ----------------------------------------------------
       BENEFICIALLY            6     SHARED VOTING POWER
         OWNED BY
           EACH                      5,156,112 shares
        REPORTING           ----------------------------------------------------
          PERSON               7     SOLE DISPOSITIVE POWER
           WITH
                                     -0- shares
                            ----------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                     5,156,112 shares
- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          5,156,112 shares
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN      [ ]
          SHARES*

          Not applicable
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          8.5%

- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON *

          IA

- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   3


- -------------------                               ------------------------------

CUSIP NO. 019754100             13G               Page     2    of    3    Pages
                                                       --------    -------
- -------------------                               ------------------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Boston Partners, Inc

- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ]
                                                                         (b) [ ]

          Not applicable

- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

        NUMBER OF                    -0- shares
          SHARES            ----------------------------------------------------
       BENEFICIALLY            6     SHARED VOTING POWER
         OWNED BY
           EACH                      5,156,112 shares
        REPORTING           ----------------------------------------------------
          PERSON               7     SOLE DISPOSITIVE POWER
           WITH
                                     -0- shares
                            ----------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                     5,156,112 shares
- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          5,156,112 shares
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN      [ ]
          SHARES*

          Not applicable
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          8.5%

- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON *

          CO

- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   4



- -------------------                               ------------------------------

CUSIP NO. 019754100             13G               Page    3     of    3    Pages
                                                       --------    -------
- -------------------                               ------------------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Desmond John Heathwood

- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              (a) [ ]
                                                                         (b) [ ]

          Not applicable

- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          United States

- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

        NUMBER OF                    -0- shares
          SHARES            ----------------------------------------------------
       BENEFICIALLY            6     SHARED VOTING POWER
         OWNED BY
           EACH                      5,156,112 shares
        REPORTING           ----------------------------------------------------
          PERSON               7     SOLE DISPOSITIVE POWER
           WITH
                                     -0- shares
                            ----------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                     5,156,112 shares
- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          5,156,112 shares
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN      [ ]
          SHARES*

          Not applicable
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

          8.5%

- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON *

          IN

- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   5




Item 1(a).        Name of Issuer:  Allmerica Financial Corporation (the
                  "Issuer").

Item 1(b).        Address of Issuer's Principal Executive Offices:
                  440 Lincoln Street, Worcester, MA  01653

Item 2(a).        Names of Persons Filing:  Boston Partners Asset Management,
                  L.P. ("BPAM"), Boston Partners, Inc. ("Boston Partners"), and
                  Desmond John Heathwood.  BPAM, Boston Partners, and Mr.
                  Heathwood are sometimes referred to collectively herein as
                  the "Reporting Persons."

Item 2(b).        Address of Principal Business Office or, if None,
                  Residence: The address of the principal business office of
                  BPAM, Boston Partners, and Mr. Heathwood is 28 State Street,
                  20th Floor, Boston, MA 02109.

Item 2(c).        Citizenship:  BPAM is a Delaware limited partnership.  Boston
                  Partners is a Delaware corporation.  Mr. Heathwood is a
                  United States citizen.

Item 2(d).        Title of Class of Securities:  Common Stock, $.01 par value
                  ("Common Stock").

Item 2(e).        CUSIP Number:  019754100

Item 3.           If this statement is filed pursuant to Rule 13d-1(b) or
                  13d-2(b) or (c), check whether the person
                  filing is a:

                           (a)      [ ]     Broker or dealer registered under
                                            section 15 of the  Act (15 U.S.C.
                                            78o).

                           (b)      [ ]     Bank as defined in section
                                            3(a)(6) of the Act (15 U.S.C.78c).

                           (c)      [ ]     Insurance Company as defined in
                                            section 3(a)(19) of the Act (15
                                            U.S.C.78c).

                           (d)      [ ]     Investment Company registered
                                            under section 8 of the Investment
                                            Company Act of 1940 (15 U.S.C.
                                            80a-8).

                           (e)      [ X ]   An investment adviser in accordance
                                            with Rule 13d-1(b)(1)(ii)(E);

                           (f)      [ ]     An employee benefit plan or
                                            endowment fund in accordance with
                                            Rule 13d-1(b)(1)(ii)(F);

                           (g)      [ ]     A parent holding company or
                                            control person in accordance with
                                            Rule 13d-1(b)(1)(ii)(G);

<PAGE>   6

                           (h)      [ ]     A savings association as defined
                                            in section 3(b) of the Federal
                                            Deposit Insurance Act (12 U.S.C.
                                            1813);

                           (i)      [ ]     A church plan that is excluded
                                            from the definition of an
                                            investment company under Section
                                            3(c)(14) of the Investment Company
                                            Act of 1940 (15 U.S.C.80a-3);
                                            
                           (j)      [ ]     Group, in accordance with Rule
                                            13d-1(b)(1)(ii)(J).

Item 4.           Ownership.

       (a)        Amount Beneficially Owned: Each of the Reporting Persons may
                  be deemed to own beneficially 5,156,112 shares of Common
                  Stock at December 31, 1998. BPAM owns 5,156,112 of record
                  shares of Common Stock. As sole general partner of BPAM,
                  Boston Partners may be deemed to own beneficially all of the
                  shares of Common Stock that BPAM may be deemed to own
                  beneficially. As principal stockholder of Boston Partners,
                  Mr. Heathwood may be deemed to own beneficially all of the
                  Common Stock that Boston Partners may be deemed to own
                  beneficially. Therefore, each of the Reporting Persons may be
                  deemed to own beneficially 5,156,112 shares of Common Stock
                  of the Issuer.

       (b)        Percent of Class: 8.5% for all Reporting Persons. The
                  foregoing percentage is calculated based on the 60,353,982
                  shares of Common Stock outstanding on November 1, 1998 as
                  reported on the Form 10-Q for the quarter ended September 30,
                  1998.

       (c)        Number of shares as to which such person has:

                  (i)      sole power to vote or to direct the vote:  0 shares
                           for all Reporting Persons.

                  (ii)     shared power to vote or to direct the vote:
                           5,156,112 shares for all Reporting Persons.

                  (iii)    sole power to dispose or to direct the disposition
                           of: 0 shares for all Reporting Persons.

                  (iv)     shared power to dispose or to direct the disposition
                           of: 5,156,112 shares for all Reporting Persons.

                  Pursuant to Rule 13d-4, each of Boston Partners and Mr.
                  Heathwood expressly disclaims beneficial ownership of any
                  shares of Common Stock of the Issuer.

Item 5.           Ownership of Five Percent or Less of a Class.

<PAGE>   7

                  Not applicable.

Item 6.           Ownership of More than Five Percent on Behalf of Another
                  Person.

                  BPAM holds all of the above 5,156,112 shares under management
                  for its clients, who have the right to direct the receipt of
                  dividends, to receive dividends from such shares and to
                  receive the proceeds from the sale of such shares. None of
                  these clients holds more than five percent of the Common Stock
                  of the Issuer.

Item 7.           Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported on by the Parent Holding
                  Company.

                  Not applicable.

Item 8.           Identification and Classification of Members of the Group.

                  Not applicable.  BPAM, Boston Partners and Mr. Heathwood
                  expressly disclaim membership in a "group" as defined in Rule
                  13d-5(b)(1).

Item 9.           Notice of Dissolution of Group.

                  Not applicable.

Item 10.          Certification.

                  By signing below we certify that, to the best of our knowledge
                  and belief, the securities referred to above were acquired and
                  are held in the ordinary course of business and were not
                  acquired and are not held for the purpose of or with the
                  effect of changing or influencing the control of the issuer of
                  the securities and were not acquired and are not held in
                  connection with or as participant in any transaction having
                  that purpose or effect.


<PAGE>   8


                                   SIGNATURE

         After reasonable inquiry and to the best of our knowledge and belief,
we certify that the information set forth in this statement is true, complete
and correct. We also hereby agree to file this statement jointly pursuant to the
agreement set forth as Exhibit 1 hereto.

Dated:  February 12, 1999

BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.,
         its general partner

         By:      /s/ William J. Kelly
                  --------------------
                  William J. Kelly
                  Treasurer and Senior Vice President

BOSTON PARTNERS, INC.

         By:      /s/ William J. Kelly
                  --------------------
                  William J. Kelly
                  Treasurer and Senior Vice President


/s/ William J. Kelly
- -------------------------
Desmond John Heathwood
by:      William J. Kelly
         Attorney-in-Fact*

*        Signed pursuant to a Power of Attorney executed by Desmond John 
Heathwood, a copy of which is filed herewith.


<PAGE>   9
                                                                       EXHIBIT 1

                                   AGREEMENT

         Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Allmerica Financial Corporation.

         This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

         EXECUTED this 12th day of February, 1999.

BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.
         its general partner

         By:      /s/ William J. Kelly
                  --------------------
                  William J. Kelly
                  Treasurer and Senior Vice President

BOSTON PARTNERS, INC.

         By:      /s/ William J. Kelly
                  --------------------
                  William J. Kelly
                  Treasurer and Senior Vice President


/s/ William J. Kelly
- --------------------------
Desmond John Heathwood
by:      William J. Kelly

         Attorney-in-Fact*

*        Signed pursuant to a Power of Attorney executed by Desmond John 
Heathwood, a copy of which is filed herewith.


<PAGE>   1
                                                                    EXHIBIT 24.1

                               POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned, Desmond John
Heathwood, hereby constitutes and appoints William J. Kelly and Mary Ann
Iudice his true and lawful attorneys-in-fact and agents, for him and in his
name, place and stead, to sign any Schedule 13G or Schedule 13D relating to
beneficial ownership and changes in beneficial ownership of equity securities
of the companies set forth on Exhibit A hereto (each, a "Company" and,
collectively, the "Companies"), and any amendment thereto, and to file the
same, with all exhibits thereto and other documents in connection therewith,
with the U.S. Securities and Exchange Commission, and submit copies thereof to
any securities exchange or automated quotation system and to the applicable
Company, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite or necessary
to be done, as fully to all intents and purposes as the undersigned might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents may lawfully do or cause to be done by virtue
hereof.  This power-of-attorney shall expire at such time as the undersigned
ceases to be subject to filing requirements under Section 13(d) and/or 13(g)
under the Securities and Exchange Act of 1934, as amended, with respect to the
Companies.


                                   /s/ Desmond J. Heathwood
                                   ------------------------
                                   Desmond John Heathwood

                                   Dated: February 9, 1998





<PAGE>   2



                                                                       EXHIBIT A

                     Companies Subject to Power of Attorney
                          Dated as of February 9, 1998


               American General Hospitality Corporation
               Bank Plus Corporation
               Calpine Corporation
               Chris-Craft Industries, Inc.
               Golden State Bancorp, Inc.
               Mid-America Apartment Communities, Inc.
               Public Service Company of New Mexico
               RFS Hotel Investors, Inc.
               Security-Connecticut Corporation
               Shopko Stores, Inc.
               SLM Holding Corporation
               The Vanguard Group, Gemini II Inc. (closed end fund)
               Wang Laboratories, Inc.
               Allmerica Financial Corporation
               BJ's Wholesale Club, Inc.
               Bowne & Co., Inc.
               Caltec Net Lease Realty, Inc.
               Chiquita Brands International, Inc.
               Equity Inns, Inc.
               Harcourt General, Inc.
               Highlands Insurance Group, Inc.
               Horace Mann Educators Corporation
               IPC Holdings, Ltd.
               Long Island Lighting Company
               Moog, Inc.
               National Presto Industries, Inc.
               PFF Bancorp, Inc.
               WMS Industries Inc.
               Woolworth Corporation







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